Since you changed spark components lately, I would lean towards an install issue. When my pump failed, it did not sputter, felt more like someone had a cable attached to my car and was adding crazy drag.

If nothing has changed in your tune I would troubleshoot in this order:

Spark first
1> Check your plugs to see if they are fouled. Look down in the cylinder to see if your full of fuel (from lack of firing)
2> Test wires, cap.

Fuel system.. if spark checks
1> Check for fuel leaks. This will cause a drop in pressure, which could kill your upper RPM.
2> Hook up a gauge to your fuel line at the rail, test the pressure.
3> Swap the filter (10 bucks) - seems like you did this.
4> Try the pump (shrug)